Steam-turbine.



No. 877,873. PATENTED JAN. 28,. 1908.

E. 0. TERRY.

STEAM TU'RBIN E.

APPLICATION FILED NOV. 18, 1907.

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, EQG'. TERRY.

STEAM TURBINE. APPLIGATION FILED NOV.18,1907.

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PATENTED JAN. 28, 1908.-

B. G. TERRY. STEAM TURBINE. APPLICATION FILED NOV. 18,1907.

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. (/f/Vfi/ 3/ Y ff/jnesss's. 4a 38 J jflvgnyafl UNITED STATES PATENTOFFICE.

EDWARD C. TERRY, OF HARTFORD, CONNECTICUT, ASSIGNOR TO TERRY STEAMTURBINE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION.

STEAM-TURBINE.

No. 879,873. J

Specification of Letters Patent.

Patented Jan. 28, 1908.

Application filed November 18. 1907. Serial No. 402575.

To all whom it may concern:

Be it known that I, EDWARD C. TERRY, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certainnew anduseful Im rovements in Steam-Turbines, of which tlie following is a specification.

My invention relates to improvements in steam turbines; particularly tosteam turbines made in substantial accordance with Letters Patent No.741,385, granted to me Oct. 13, 1903, and the objects of my improvementsare simplicity and economy in construction, together with convenience inassembling the parts and a substantial and reliable machine whenassembled.

In the accompanying drawings :Figure 1 is a side elevation of my steamturbine. Fig. 2 is a plan view of the lower part of the case withcertain parts attached. Fig. 3 is a vertical section of the case, with aside elevation of the'whee-l and most of the reversing chambers, theplane of section being in dicated by the line w a: of Fig. 2, looking inthe direction indicated by the dart. Fig. 4 is a vertical section of thelower part ,of the case on the line y y of Fig. 1. Fig. 5 is an enlargedsectional plan view of certain parts, on line 2 of Fig. 1. Fig. 6 is avertical section of a portionof the lower part of the case on the line 8s of Fig. 5. Fig. 7 is an enlarged sectional view of a portion of thewheel, together with a side view of a portion of the wheel, the portionshown in side elevation being at the right hand end of the said view.Fig. 8 is a sectional view of a portion of the wheel on the line t t of7.

. ig. 9 is a detached plan view of one of the bucket plates.

The case is made in two parts the same being divided horizontally in theplane of the axis of the wheel. The lower part A is provided at one endwith an exhaust 10, while on one side is a steam chamber 11, having aseat or connection 12 for the attachment of a steam supply pipe, notshown. The steam chamber 11 extends over nearly the hall circle of thesaid lower part ofthe case as indicated by broken lines in Fig. 1. At ornear the upper ends of this steam chamber is a pipe seat or connection13, by which to connect a bracket pipe or elbow 14, the upper ends ofwhich bracket pipes are preferabl in the horizontal plane of thedividing line between the lower part A and upper part B of the case asshown in Fig. 1. The said upper part B hastwo separate steam chambers15,. 16, or more properly two sub-sections of the complete steamchamber, and each of these sub-sections are provided with seats orconnections, like the seats 13, by which to attach a bracket pipe orelbow 14, as shown at the left in Fig. 1, or if desired, a right anglecut off valve 1.8, as shown at the right in Fig. 1. These bracket pipesor pipe and valve, connect the steam chamber 11 in the lower part A ofthe case with the two steam chambers or sub-sections in the upper part Bof the case, so that the whole together constitute one steam chamberthat extends substantially in an annular form for nearly the wholecircumference of the case.

The ends of all the steam chambers, or sections are closed so that thereis no communi the pipe brackets. That wall of these clian1- here whichlies nearest to the wheel chamber of the case is provided with jet ports19, Figs. 3 and 5, and as indicated in broken lines in Fig. 1, forletting the steam into the jet bodies 20 within the case. As shown,there are four of these jet-ports in the steam cham ber 1.1 and two eachin the steam chambers 5 and 16. The number and special location of thejet ports may vary according to circumstances. By the employment of acut off valve in one or both of the pipe connections between the chamberin the up per and lower parts of the case, the steam may be cut off from,a part of these ports, as may be desired. Suitable packing or gasketsmay be employed to make tight joints for the bracket pipes, but inasmuchas the steam chamber does not open intothe wheel case, (except throughthe jet ports) it is not necessary to lace any gasket betueen the twoparts of t e case.

The wheel C is mounted in the case on the shaft 21, and is, with theexcey tion of certain details herein after described, the same as in myaforesaid atent. The reversing chambers 22 are in t e main the sa ne asin the said patent, although they are differently put togetherand aremounted differently- They are grouped or assembled ir segments of fourchambers each and are II1( unted on annular in any proper manner, as forexample by i he rib i or flange 23 is on the ste"am chamber side of .inmy aforesaid patent.

- between the bucket flanges or ribs 23 and 24, where they areheldjections are preferably formed of integral means of screws 25, Figs.2 and 5.

the case and is broken at points to make room for jet bodies 20." Theflange 24-on the opposite side of the case has bosses 26 formed integraltherewith and with the sides of the case, which bosses are drilled andthreaded to receive abutting bolts 25. The jet ports are counter bored'or swept off to form smooth seats for the flanged end of the jet bodies20, as best shown in Fig. 5. The other end of the jet bodies are formedwith an. abutment or seat 28, for the other ends of theibolts to abut.The hollow jet bodies are provided with jet nozzles 29, which are set inosition to send a jet of steam through the lirst one of the.reversingchambers of each segment at one side edge of the said chamber,into the buckets of the wheel near one side substantially the same, in ageneral way, as In order to secure the jet bodies in place it is onlynecessary to turn in the bolts 27, lace the body in the proper positionand t en unscrew the bolts to force the head firmlyagainst the abutmentof the jet body to hold it in lace as best shown in Fig. 5. Turning u te set nut 30 will prevent any accidental oosening of the parts.

As in my aforesaid atent the wheel C is formed of two side p atesandbuckets set therein at the periphery of the wheel. These side platesor disks 31 are provided with notches 32 that extend inwardly fromtheedge in a direction obliquely to a radial line. The 0 posing innerfaces of the side plates of the W eel are formed with annular groovesnear theiredge and inside of these grooves oblique grooves 33 areformed, the same extending inwardly in alinement with the notches 32.The buckets are formed of plates 34 set into the said notches andgrooves, and curved edge plates 35 placed plates to complete thesubstantially semi-circular or U shaped buckets. These edge plates areshouldered near their outer ends and these shoulders are let into theannular grooves, in the opposing faces of the two side plates of thewheel,

in a general way the same as in my aforesaid patent.

"In my present invention the outer wall or ,shoulder 36 of the annulargrooves 37 is under-cut or dove-tailed as shown in Fig. 8. The wings 38of the bucketplates 34 are a little less in width, measuring from theouter edge inwardly, than the depth of the notches 32 in the edge of thewheel, and the grooves .33 are a little deep r than the width of thebucket plates, measured in the same way. Each bucket late is providedwith three projections 39 or the outer wall or face of the edge plates35 to abut against. These protongues or slugs cut on three sides fromthe body of the plate, and then the free ends of the tongues or slugsare bent so as to project slightly, as best shown in Fig. 7. outer endsof the edge plates, as in my former patent, are reduced in thickness toform a shoulder for abutting against the outer wall of the annulargroove 37, and in my present invention this shoulder 40 is of a beveledor dove-tail form to fit and engage the correspondingly shaped shoulder36 of the annular groove 37.

In assembling the parts a bucket plate is pushed. edgewise into thegrooves 33 with the wings 38 in the notches 32. It is pushed in a littlebeyond its final position, the depth of the notches and groovespermitting this to be done. An edge plate is next crowded into positionon that side of the bucket plate from which the projections39 extend.The outer ends of these edge plates are pressed towards each other alittle to permit the shoulders 40 to pass in between the two sidesplates 31, until the said shoulders face the annular grooves 37. Theresiliency of the metal will then force the ends of the edge platesapart to carry the shoulders into the said grooves. If desiredone bucketplate and one edge plate may be ushed into place simultaneously insteadof separately. In either case, after insertion, the bucket plate andedge plate are together forced outwardly until the dove-tail shouldersof the edge plate and annular groove snugly engage each other and theprojections 39 are in contact with the outer curved face of the edgeplate. Another bucket plate and edge plate is then added in like mannerand so on until the wheel is completed. The friction of the parts whenthus constructed will hold the buckets in position when once properlyThe placed. The dove-tail shoulders will always hold the outer ends ofthe edge plates closely against the side plates of the wheel.

I claim as my invention- 1. In a steam turbine, a case divided intointhe upper part of the said case, and outside connectionsbetween the saidchamber in the lower and the chambers in the upper part of the case.

3. In a steam turbine, a case having a steam chamber in one side thereofwith jet ports leading from the said chamber to the interior of thecase, jet bodies seated on the side of the case over the said jet ports,and

abutting bolts on thesoppositeslde of the case for holding the said jetbodies in placea 4. In a steam turbine, the case having substantiallyannular ribs on its opposite chamber in one side of the said case, jetports leadingfrom the said chamber to theinter'ior of the said case, jetbodies seated over the said jet ports, and means for holding the saidjet bodies inplace at the end of each of the segments of reversingchambers. a

n' a steam turbineya wheel having two side plates provided with annulargrooves in their opposing inner faces, bucket plates held between thesaid two side plates, and edge plates of substantially U shape, theouter ucket plates and ed e .said bucket plates, th the said annulargrooves being provided with engaging dovetall' shoulders, and the outerplates.

wall of the said annular groove having dovei tail shoulders inengagement with each other,

substantially as described.

7. In a steam turbine, a wheel having two side plates provided withannular grooves in their opposing inner faces, obli ue notches in the,outer edges of the said p ates, obli ue grooves in alinementwith saidnotches, buc etplates fitted to the said notches and rooves, projectionson oneof the broad sides 0 the said plates bearing on the e said edgeplates and curved w'all'of the saidied'ge plates engaging the broad sideprojections of the said bucket v EDWARD O. TERRY;

Witnesses: I

JAMEs ELITREVOR, JA Es TERRY.

